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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Consolidated Balance Sheet    
Trade receivables, allowances (in dollars) $ 347 $ 337
Preferred shares, par value (in dollars per share) $ 1 $ 1
Preferred shares, Authorized shares 1,000,000 1,000,000
Preferred shares, issued shares 0 0
Common shares, Authorized shares 2,400,000,000 2,400,000,000
Common shares, Issued shares 1,705,266,590 1,702,017,390
Common shares held in treasury, shares 235,271,175 229,352,338